package Array;

import java.util.ArrayList;
import java.util.List;

/**
 * @BelongsProject: SeniorArchitect-LeetCode
 * @BelongsPackage: Array
 * @Author: zhuangxiaoyan
 * @CreateTime: 2023-10-22  07:48
 * @Description: TODO
 * @Version: 1.0
 */
public class N字形变化6 {

    public String convert(String s, int numRows) {
        if (numRows < 2) {
            return s;
        }
        List<StringBuilder> rows = new ArrayList<StringBuilder>();
        for (int i = 0; i < numRows; i++) {
            rows.add(new StringBuilder());
        }
        int i = 0, flag = -1;
        for (char c : s.toCharArray()) {
            rows.get(i).append(c);
            if (i == 0 || i == numRows - 1) {
                flag = -flag;
            }
            i += flag;
        }
        StringBuilder res = new StringBuilder();
        for(StringBuilder row : rows) {res.append(row);}
        return res.toString();
    }
}
